Impact plate



Dec. 3, 1940. E. B. sYMoNS IMPACT PL'ATE Filed Oct. 24, 193B 2 Sheets-Sheet 1 five/2507? [gan $772022; y Mi kw fiffarwys Dec. 3, 1940. E. B. SYMONS IMPACT PLATE 2 Sheets-Sheet 2 Filed 001:. 24, 1938 y Val M jafarieqys.

Patented Dec. 3, 1940 PATENT OFFICE IMPACT PLATE Edgar B. Symons, Hollywood, Calif., assignor to N ordberg Manufacturing Company, Milwaukee, Wis, a corporation of Wisconsin Application October 24, 1938, Serial No. 236,611

4 Claims.

My invention relates to an improvement in impact crushers and particularly to impact plates or members usable with impact crushers.

One purpose isthe provision of plates which shall be reversible and which may, therefore, enjoy an extended period of wear before they have to berej ected.

Another purpose is the provision of reinforcing means whereby rupture of worn plates is prevented during use.

Other purposes will appear from time to time in the course of the specification and claims.

The present application is a continuation in part of my co-pending application Serial No. 185,278, filed January 17, 1938, now Patent No. 2,192,606 issued 'on Mar. 5, 1940, which in turn is a continuation in part of my application Serial No. 710,592, filed February 10, 1934, and issued as Patent No. 2,110,851 on March 8, 1938.

I illustrate my invention more or less diagrammatically in the accompanying drawings where- Figure 1 is a vertical transverse section;

Figure-2 is a detail;

Figure 3 is a partial section on the line 33 of Figure 1;

Figure 4 illustrates an impact member;

Figure 5 is a section through a modified impact member;

Figure 6 is a perspective view-of the impact member shown in Figure 5; Figure 7 is a section through a further modifie impact member;

Figure 8 is a perspective of the impact member shown in Figure 7;

Figure 9 is a view of a variant form; and

Figure 10 is a section on the line |0-|il of Figure 9.

Like parts are indicated by like characters throughout the specification and drawings.

Referring to the drawings, I generally indicates any suitable supporting structure or element which may for example .be a concrete or masonry foundation. Mounted thereon I illustrate horizontally extended I-beams 2, of which there may be two, the lower flanges 3 of which rest upon the foundation and the upper flanges 4 of which serve as supports for the impact crusher. Any suitable shaft l4 may be employed, mounted in anysuitable bearings not herein shown, since the impact crusher is not of itself part of the present invention. Keyed to the shaft M by the key I5 is a hub or body portion indicated as IS, with an outer generally cylindrical portion I! connected theretoin any suitable manner.

Extendingoutwardly from the member I! are a plurality of flanges l9 having faces 29 herein indicated asso'mewhat rearwardly inclined. End members 2| may be employed, the entire structure being secured together as by bolts 22 with nuts 23,,the various parts being appropriately apertured to receive them. Each such-ring 2|, one being shown herein, has a plurality of apertures 24', eachsuch aperture having an inclined Wedge face 25.

Seated against the faces 2|] of the end members H! are impact members 26, which I have shown for example in Figures 3 and 4. Each such impact member has at each end an end flange 21. Preferably the impact member so formed is flat and of uniform thickness throughout, including the'flanges 21. The parts are so proportioned that the parts 21 penetrate the apertures 24. In order to lock the impact members in position I employ wedge members, as shown for example in Figure 2, each such member'includi ng a wedge portion 28 adapted to seat in the aperture and having a wedge face 29 opposed to the face of the aperture. V

It will be understood that as the rotor rotates centrifugal force will tend to move the wedge outwardly with the face 29 sliding against the face 25 of the ring 2|. The result will be to force the-opposite side 36 of the wedge forcibly against the face of the adjacent flange 21 ;of the impact member. Additional means for holding. the wedge elements in position are shown and include an outer portion 3| having an elongated aperture 3|a through" which passes any suitable boltor' securing member 32 withits nut 33. Posi-' tioned within the space formed by the rings 2| are removable wear plates 34. If desired, each bolt 32 may pass throughonerof these plates and may thereafter perform the unitary service of securing thejplate 34 in position as well as cooperating with the portion 3| of the wedge 28. Additional bolts may also be'employed, as shown at 35 in Figure 1, with any suitable securing nuts 36. c c

Any suitable housing may be employed, the details-of which do not form part of the present invention, but which may include a plurality of bottom discharge members 40 and 4|. A generally vertical feed spout 43 is indicated in Figure 1, havingoneedge terminating closely adjacent the patho'f'movement of the impact members and conforming to or secured to the arcuate housing member '45 which'also conforms closely to the path of the impact members and may be hinged if desired as at it and bolted or otherwise secured in position. The opposite edge of the spout as at 47 is cut substantially out of the path of movement of the impact members, the two edges being connected by inclined side edges 48. It will be understood that the edge 44 is in the direction of approach of the impact members so that after the impact takes place ample space is left between the path of the impact members and the edge 41 for the escape of the impacted particles.

I may employ any suitable normally fixed impact members for receiving the centrifugally expelled particles. I illustrate forexample a plurality of removable plates 59, '50 which may be mounted in any suitable manner, as for example on backing members 5| which maybe bolted in' position as by the bolts 52 with the nuts 53 at each end thereof.

It will be realized that Whereas I have described and shown a practical and operative device, nevertheless many changes may be made in the size, shape, number and disposition of parts without departing from the spirit of my invention. I therefore wish my description and drawings to be taken as in a broad sense illustrative or-diagrammatic, rather than aslimiting me to my precise showing.

For example, I illustrate two variant types of impact members. Referring to the form of Figures 5 and 6, it includes a fiat body portion 60, with end flanges 6i and a rear reinforcing flange 62 extending from end to end of the impact plate and alined to and coextensive with the end flanges 5i. In-order to make easy the machining or grinding or forming of the contact edges of the reinforcing ribs 62, I provide channels or grooves 63 extending along the juncture between the rib 62 and'the members and 6|. When the form of Figures 5 and 6 is employed, the members 19 are modified by the provision of a recess 68 adaptedto receive the-rib 62. The apertures of the end plates '2! are also appropriately enlarged to permitthe extension therethrough of the ends of the rib 62 Referring to the 'form of Figures 7 and 8, it is substantially identical with the form of Figure 4, except for the addition along the upper and loweredge of a rearwardly extending reinforcing rib 65. To make easy the machining of the contacting faces,I also provide channels 66 between'the member and the body portion 2 6; -In employing the form of Figures 7 and 8, the member I 9, is modified by being somewhat shortened or recessed at the top as at 61 and by the provision of 'a recess 68 at the bottom, whereby an" abutment portion 69 is provided which penetrates'between the ribs "65 and abuts against the rear 'face of the member26.

Referring" to. the form of Figures 9 and 10, I illustrate an impact member having a forward face'portion l0 and a plurality of rear reinforcements orthickened portions ll divided by channels T2, the "portions H and thefjc'hannels 12 extending diagonally in relation to the maximum-extensionor length of the member.

lln-additi'on to the reinforcing effect, the employment of a set of thickened'portions separated by slots 12 is of value in preventing any tendency of theplate to. be bulged by the continuous hammeringon one face. Manganese is subject to flow or deformation under impact and aflat-plate such as shown for example in Figure; 4-- may, under some circumstances tend to bulge out. The employment of the slots 12 on the rear face of the plate gives the metal a chance to expand between the inner edges of the slots and the impacted surface of the plate. The effect will be to widen out the slots as the impact surface expands.

If the slots are cast straight across the plate,

they might weaken the plate and make it less resistant under centrifugal force, but this disadvantage is entirely prevented by inclining them in the diagonal position in which they are shown in Figure 9.

The use and operation of my invention are as follows:

In impact crushers of the type in which my impact members are employed, the material to be reduced-is gravitally dropped, preferably .in

an unconsolidated stream, down the spout 43.. V

The rotor is rotatedat sufficient speed in relation'to the acceleration by gravity of the particles to give a crushing impact of -adequate force. The impact members are readily applied and removed and the wedge securing means, including the wedge face 29, has the important result of causing the speed of rotation of the rotor itself to tighten up the wedges inresponse to the centrifugal outward movement of the wedges 28 and the apertures 24. However, the Wedges can easily be loosened by looseningthe nuts 33, and 'the'inner wearplates 'tl-canreadily be removedand replaced.- 7 i I I find it advantageous to make the members 26 and also the modified forms of Figures Band 8 'of such a shape "as to permit their ready reversal, since there is "an inevitable maximum of wear in the upper portion of the impact mam ber. After each impact member has become somewhat worn, it icanreadily be reversed, preferably before'being worn down too far. result is a substantial increase in economy of the manganese steel of which such members are generally made. This steel is an expensive material and the metal cost of crushing is a-substantial factor in crushing costsand thu'sin the The plate is worn all the way through in thecenter or is worn very thin, there may be some 'llSkfOf rupture. Thus, while the plate of Figure 4-constitutes a substantial advance over conventional practice, I find it-desirable-uncler some circum stances to prolong the life-of the plate and "eliminate the risk of rupture by'providing the rearward rib B2 of Figure 6 or the two rearward ribs 65 of Figure '8, in order to provide a connection extending from end to end of the plate which will not be wornthrough even though the front-Wear portion is worn practically down. This permits a definitely longer iife'of a given plate and further limits the metalwastage.

In forming manganese parts, smoothing an machining is an expensive rancldihicult operation owing to the nature of the material. I find itdesirable to provide a 'minimum surface to: be formed or machined for fitting to the opposed parts of the rotor -oriof.-its extending members '9.

Thus in the formof Figurefi the upperand lower 1. Ina breaker plate for impact crus'hers, 1a"

generally fiat plat'egmemberhavingopposite faces generally parallel with' each other, and having at each end thereof an outwardly projecting integral lug lying in the plane of the plate and intermediate the corners of the plate, said lug being of substantially the same thickness as the plate, the plate, except for said end lugs, constituting a rectangle, one face of said plate having outwardly extending therefrom a plurality of parallel integral rearwardly extending reinforcing ribs extending from edge to edge of the plate, one of said ribs being located along each of the long edges of the plate.

2. In a breaker plate for impact crushers, a generally fiat plate member having opposite faces generally parallel with each other, and having at each end thereof an outwardly projecting integral lug lying in the plane of the plate and intermediate the corners of the plate, said lug being of substantially the same thickness as the plate, the plate, except for said end lugs, constituting a rectangle, one face of said plate having outwardly extendingtherefrom an integral rearwardly extending reinforcing rib extending from end to end of the plate, intermediate the long edges thereof.

3. In a breaker plate for impact crushers, a generally fiat plate member having opposite faces generally parallel with each other, and having at each end thereof an outwardly projecting integral lug lying in the plane of the plate and intermediate the corners of the plate, said lug being of substantially the same thickness as the plate, the plate, except for said end lugs, constituting a rectangle, one face of said plate having outwardly extending therefrom an integral rearwardly extending reinforcing rib extending from end to end of the plate, intermediate the long edges thereof, its ends extending rearwardly of and integral with said outwardly projecting lugs.

4. In a breaker plate for impact crushers, a generally flat plate member having opposite faces generally parallel with each other, said plate constituting generally a rectangular, one face of said plate having outwardly extending therefrom a plurality of parallel integral rearwardly extending reinforcing ribs extending from end to end of the plate along opposite edges of the plate, and securing means for attaching said plate, spaced away from said reinforcing ribs and substantially equidistant therefrom.

EDGAR B. SYMONS. 

